"SEOUL, South Korea — Secretary of State Mike Pompeo said that in his meeting with Kim Jong-un on Sunday, the leader of North Korea had agreed to allow inspectors into a key nuclear testing site that the North has claimed it blew up, a down payment on the country’s commitment to denuclearize the country. Mr. Pompeo, whose planned trip to the North in August was canceled by President Trump because of a lack of progress, described his few hours on the ground in Pyongyang, the capital, as a “good trip.” The two men discussed “the upcoming second summit” between Mr. Trump and Mr. Kim, refining options for the time and place of the next meeting between the two leaders, said Heather Nauert, a State Department spokeswoman. But no date or place was announced."

They have haven't built a new test site that we know of, but it's not clear they need additional testing. There is some question and how small they have gotten a working bomb, but no question they have working devices which fundamentally changed the conversation.